"Why am I crying on Oprah?" Pharrell joked after Winfrey showed him a fan version of his Academy Award-nominated song "Happy."

The fan-generated video shows groups of people from all over the world dancing and singing to "Happy," the original song for the movie "Despicable Me 2."

"It's overwhelming because I love what I do and I just appreciate the fact that people have believed in me for so long that I could make it to this point," Pharrell said, trying to contain his tears of happiness.